CN111395169A - Construction method of deepwater steel trestle bored pile - Google Patents
Construction method of deepwater steel trestle bored pile Download PDFInfo
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- CN111395169A CN111395169A CN202010177960.0A CN202010177960A CN111395169A CN 111395169 A CN111395169 A CN 111395169A CN 202010177960 A CN202010177960 A CN 202010177960A CN 111395169 A CN111395169 A CN 111395169A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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Abstract
The invention discloses a construction method of a deepwater steel trestle cast-in-situ bored pile, which comprises the implementation of preparation work, process flow design and construction steps, wherein the construction steps comprise: (3a) positioning a floating platform; (3b) lowering the steel casing; (3c) punching; (3d) checking and accepting the formed holes; (3e) lowering a reinforcement cage; (3f) secondary hole cleaning; (3g) and (5) pouring concrete. According to the invention, the front half part of the buoyancy tank is lifted to the draught of about 30cm by adopting the chain block of 20t on 2 positioning piles, the thrust is carried out, the platform has the condition of large shaking, the chain block is tensioned again for adjustment, and the positioning of the floating platform is completed after repeated testing to the optimal state. Adopt chain block to mention the flotation tank, utilize flotation tank weight to carry out the application of pressure to the spud pile, the stability of multiplicable spud pile reduces because of the displacement of vibrations to the platform.
Description
Technical Field
The invention relates to a construction method of a steel trestle, in particular to a construction method of a cast-in-situ bored pile of a deep water steel trestle, and belongs to the technical field of cast-in-situ bored piles.
Background
Along with the continuous development of bridge engineering, more and more bridges set up high pile cap in the river course to satisfy the design requirement of bridge structures, before bridge pile foundation and cushion cap construction, need set up interim construction trestle and construction platform earlier and provide the main bridge construction place.
For example, a three-gate river-crossing river bridge, a white sand bridge, a phoenix ridge bridge and other bridges in Guangxi Liuzhou all have underwater high-rise pile cap, and a construction trestle and a drilling platform are also indispensable, but the bottom of a riverbed is bare rock, and the river has the characteristic of water depth. The existing construction methods comprise fishing method construction and rotary drilling rig construction. The construction method of fishing method is characterized by that it adopts the truck crane matched with vibration hammer to make inserting-driving of steel pipe pile on the bank side, then the upper portion structures of Bailey beam and cross beam are hoisted and erected to form temporary trestle bridge, and the method can be used for gradually advancing. The construction of the rotary drilling rig is that a floating box is used for carrying the rotary drilling rig to carry out rotary drilling construction, after pile foundation construction is completed, a steel pipe upright post is lengthened, and then a large-scale floating crane or a ship crane is used for installing an upper structure to form a temporary trestle; its advantages are high hole-forming speed and high pile foundation locating precision; the disadvantage is that the cost of entering and exiting is high, and the drilling can not be carried out in deep water areas because the length of the drill rod is insufficient.
In order to reduce the cost, most of the floating platforms are used for carrying percussion drills to drill holes, and how to accurately position the floating platforms in water is a main research direction for ensuring that the drills are not influenced by impact force and are stably constructed in the drilling process.
Disclosure of Invention
The invention aims to solve the problems and provide a construction method of a cast-in-situ bored pile of a deep water steel trestle.
The invention achieves the aim through the following technical scheme, and the construction method of the deepwater steel trestle bored pile comprises the implementation of preparation work, process flow design and construction steps, and comprises the following steps:
step (1), preparation work: before construction, sounding the river bed elevation at the pile foundation by using a depth finder, and determining the lowering length of the steel casing; (1, b) performing technical and safety intersection on constructors before operation, and explaining major hazard sources and cautions existing in the process; (1, c) all the needed relevant tools, tools and instruments are in place, and normal operation of field electric and mechanical equipment is ensured; the main equipment is as follows: the method comprises the following steps of self-manufacturing a floating platform, an 80t floating crane, a self-manufacturing floating platform, a 25t ship crane, a tank truck ship, a D630 vibration hammer, an air compressor and a CK3000 impact drill;
designing a process flow in the step (2): sequentially preparing construction, anchoring and positioning a floating platform, lowering a protective cylinder, drilling, forming holes, cleaning the holes, pouring a lower reinforcement cage and concrete, preparing a reinforcement raw material to detect whether the raw material meets the use standard of the raw material at the construction preparation stage, and simultaneously making the reinforcement cage in advance;
and (3) implementation of the construction step: (3a) the construction method comprises the following steps: positioning a floating platform; (3b) and a second construction step: lowering the steel casing; (3c) and a third construction step: punching; (3d) the construction step four: checking and accepting the formed holes; (3e) the construction step five: lowering a reinforcement cage; (3f) the construction step six: secondary hole cleaning; (3g) the construction step seven: pouring concrete;
positioning the floating platform: the floating platform is pulled to a designated position by adopting the assault boat, and the total station tracks in real time; throwing the anchor blocks in four directions to the position of about 50m by using an 80t floating crane to ensure the stability of the floating platform; inserting and striking a D630 positioning steel pipe to the rock surface by adopting an 80t floating crane and a D90 vibration hammer; 2 hand chain blocks of 20t are hung on the steel pipe upright post and tensioned to keep the floating platform in a semi-suspension state, so that the floating platform is ensured to shake forwards and backwards due to the influence of impact force in the process of rushing in;
the cylinder body is lowered (1) a steel casing with the diameter of 1520 × 10mm is lowered to a rock stratum along a guide frame by adopting an 80t floating crane, the casing is inserted into the rock stably by adopting a 25t boat crane and a vibration hammer, after the casing is inserted and beaten stably, whether the axis of the casing meets the requirement is measured, if so, the casing top is beaten by the vibration hammer according to the instruction sent by a measuring person for adjustment, and the floating platform and the steel casing are limited by adopting channel steel welding;
the punching: after the drill is positioned, a 25t boat crane is adopted to install and debug the hammer; backfilling partial rubbles and clay according to the proportion of 3: 1; the low stroke is rushed until the hammer is stable; normal flushing, repeatedly dragging the slag by using a slag dragging barrel when the slag is too thick;
and (3) checking and accepting the formed holes: after the rushing-in reaches the designed rock entry elevation, informing the participating parties of performing hole forming acceptance check on site representatives; during the acceptance, providing drilling record, slag sample and mechanical pore-forming acceptance record and technical cross-bottom data; after the height of the top of the pile casing is measured again, measuring the hole depth by using a measuring rope, and calculating whether the actual rock entering elevation meets the design requirement; and detecting whether the thickness of the sediment meets the design requirement.
The steel reinforcement cage is put down, namely the steel reinforcement cage is manufactured and molded in a steel reinforcement processing field, the outer diameter of the cage is 135cm, 22 threaded steel bars with the diameter of 25mm are adopted as main reinforcements, the total length is 10m, and 25t boat cranes are adopted for putting down and transporting to the orifices for lifting and putting down; calculating the length of the hanging bar according to the rock surface elevation and the pile casing top elevation before lowering; after the reinforcement cage is put down in place, the hanging ribs and the steel protection cylinder are welded and fixed, so that the reinforcement cage is prevented from floating upwards in the concrete pouring process;
and (3) secondary hole cleaning: secondary hole cleaning is carried out by adopting a gas lift reverse circulation method (clear water); the air compressor equipment is placed on the slurry ship, and the slag discharge pipe is connected with the cabin to form a waste slag pool; in the gas lift reverse circulation process, clear water is supplemented into the hole in time, and the height of a water head is strictly controlled; the bottom of the hole needs to shake repeatedly during the hole cleaning process, so that residues are prevented from being left at the bottom of the hole;
pouring the concrete: the trestle pile foundation is underwater C30 concrete, and the concrete is transferred to a tanker ship in water by a land tanker through a chute arranged at the shore; the tank car ship conveys the concrete to an orifice to be poured, and a hopper with the diameter of 150cm is adopted for pouring; pouring concrete into a hopper in a self-discharging manner, and then beginning to pour by cutting balls; and measuring the elevation of the concrete in the hole at any moment in the process, and stopping pouring after the elevation reaches the designed elevation.
Preferably, during the positioning of the floating platform, attention should be paid to the fact that the anchoring does not exceed the range of a channel, and after the anchoring is finished, a specially-assigned person commands the ship and the steel wire rope cannot be scraped to cause the displacement of the floating platform. Once the scraping phenomenon occurs, the steel wire rope of the winch is required to be quickly loosened to prevent the steel wire rope from being damaged.
Preferably, during the barrel is transferred, before the protective barrel is transferred, a measuring rope is adopted to measure the elevation of the river bed, the blanking length of the steel protective barrel is calculated reversely, a processing field is informed of stock preparation in advance, and the situation that the protective barrel cannot be transferred due to insufficient length is prevented.
Preferably, during the downward placement of the cylinder body, the deviation of the steel casing is not more than 300mm, and the inclination is not more than 1%.
Preferably, during the punching, when the hole is opened, the small stroke punching is adopted to prevent the casing from deviating, and the hole can be normally punched after the hole completely enters the rock stratum.
Preferably, in the pore-forming inspection, the pore depth should exceed the designed pore depth by 50 mm-10 mm; the thickness of the sediment is not more than 50 mm.
Preferably, when the reinforcement cage is placed downwards, the calculation formula of the length of the lifting rib = the top elevation of the protective cylinder-the rock surface elevation-5 m, and the length of the lifting rib does not account for the length of the lap joint part.
Preferably, during concrete pouring, the distance between the bottom of the guide pipe and the bottom of the hole is 30-40 cm when the guide pipe is installed.
Preferably, in the concrete pouring process, the quantity of the first batch of concrete should meet the requirement that the first embedding depth of the conduit is more than 1.0 m.
Preferably, during the concrete pouring, the embedding depth of the guide pipe is preferably controlled to be 2 m-6 m, the pouring is suspended when the embedding depth exceeds the range, and the pouring can be continued after the upper section of the guide pipe is removed.
The invention has the beneficial effects that:
1. and (3) lifting the front half part of the buoyancy tank to the draught depth of about 30cm by adopting a 20t chain block on 2 positioning piles, trying to rush in, if the platform still has the condition of large shaking, tensioning the chain block again to adjust, and repeatedly testing to the optimal state to complete the positioning of the floating platform.
2. Adopt chain block to mention the flotation tank, utilize flotation tank weight to carry out the application of pressure to the spud pile, the stability of multiplicable spud pile reduces because of the displacement of vibrations to the platform.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Fig. 2 is a schematic view of the positioning structure of the floating platform of the present invention.
Fig. 3 is a schematic view of the chain block of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
A construction method of a deepwater steel trestle bored pile comprises the implementation of preparation work, process flow design and construction steps, and comprises the following steps:
step (1), preparation work: before construction, sounding the river bed elevation at the pile foundation by using a depth finder, and determining the lowering length of the steel casing; (1, b) performing technical and safety intersection on constructors before operation, and explaining major hazard sources and cautions existing in the process; (1, c) all the needed relevant tools, tools and instruments are in place, and normal operation of field electric and mechanical equipment is ensured; the main equipment is as follows: the method comprises the following steps of self-manufacturing a floating platform, an 80t floating crane, a self-manufacturing floating platform, a 25t ship crane, a tank truck ship, a D630 vibration hammer, an air compressor and a CK3000 impact drill;
designing a process flow in the step (2): sequentially preparing construction, anchoring and positioning a floating platform, lowering a protective cylinder, drilling, forming holes, cleaning the holes, pouring a lower reinforcement cage and concrete, preparing a reinforcement raw material to detect whether the raw material meets the use standard of the raw material at the construction preparation stage, and simultaneously making the reinforcement cage in advance;
and (3) implementation of the construction step: (3a) the construction method comprises the following steps: positioning a floating platform; (3b) and a second construction step: lowering the steel casing; (3c) and a third construction step: punching; (3d) the construction step four: checking and accepting the formed holes; (3e) the construction step five: lowering a reinforcement cage; (3f) the construction step six: secondary hole cleaning; (3g) the construction step seven: pouring concrete;
the specific implementation method comprises the following steps:
floating platform construction method
1. Preparation work:
(1) before construction, a depth finder is adopted to detect the elevation of the riverbed at the position of the pile foundation, and the lowering length of the steel casing is determined.
(2) Before the operation, the technical and safety issues are handed over to the constructors, and the important danger source and the attention items existing in the process are explained.
(3) All related tools, tools and instruments are required to be in place, and normal operation of field electric and mechanical equipment is ensured. The main equipment is as follows: the device comprises a self-made floating platform, an 80t floating crane, a self-made floating platform, a 25t ship crane, a tank truck ship, a D630 vibration hammer, an air compressor and a CK3000 impact drill.
2. Designing a process flow:
sequentially preparing construction, anchoring and positioning a floating platform, lowering a protective cylinder, drilling, forming holes, cleaning the holes, pouring a lower reinforcement cage and concrete, preparing a reinforcement raw material to detect whether the raw material meets the use standard of the raw material at the construction preparation stage, and simultaneously making the reinforcement cage in advance;
3. the construction steps are as follows:
the construction method comprises the following steps: floating platform positioning
(1) And (4) pushing and dragging the floating platform to an appointed position by adopting the assault boat, and tracking the total station in real time.
(2) And an 80t floating crane is adopted to throw the anchor blocks in four directions to the position of about 50m, so that the stability of the floating platform is ensured.
(3) And D630 positioning steel pipes are inserted and punched to the rock surface by adopting an 80t floating crane and a D90 vibration hammer.
(4) 2 hand chain blocks of 20t are hung on the steel pipe upright post and tensioned to keep the floating platform in a semi-suspension state, so that the floating platform is ensured to shake forwards and backwards due to the influence of impact force in the process of rushing into the floating platform.
In the construction step, attention should be paid to the fact that the range of a channel cannot be exceeded when anchoring is conducted, a specially-assigned person commands a ship after anchoring is completed, and a steel wire rope cannot be scraped to cause displacement of a floating platform. Once the scraping phenomenon occurs, the steel wire rope of the winch is required to be quickly loosened to prevent the steel wire rope from being damaged.
And a second construction step: lowering of steel casing
(1) An 80t floating crane is used to lower a phi 1520 × 10mm steel casing down the guide frame to the rock formation.
(2) And (5) adopting a 25t boat crane to match with a vibration hammer to insert the pile casing into the rock stably.
(3) After the inserting and beating are stable, whether the axis of the pile casing meets the requirement is measured, and if the axis of the pile casing has deviation, a vibration hammer is adopted to beat the top of the pile casing for adjustment according to an instruction sent by a measuring person.
(4) And (4) welding and limiting the floating platform and the steel casing by adopting channel steel.
In the construction step, the deviation of the steel casing is not more than 300mm, the gradient is not more than 1%, the elevation of the river bed is measured by adopting a measuring rope before the casing is placed, the blanking length of the steel casing is calculated reversely, a processing field is informed to prepare materials in advance, and the situation that the casing cannot be placed due to insufficient length is prevented.
And a third construction step: rushing in
(1) After the drill is positioned, the hammer head is installed and debugged by adopting a 25t boat crane.
(2) And backfilling part of the rubbles and the clay according to the proportion of 3: 1.
(3) The low stroke is rushed into the hammer head stably.
(4) And (5) normally flushing, and repeatedly fishing the slag by using a slag fishing barrel when the slag is too thick.
In the construction step, small-stroke punching is adopted during hole opening, so that the protective cylinder is prevented from deviating, and the hole can be normally punched after the hole completely enters the rock stratum.
The construction step four: acceptance of pore-forming
(1) And after the rushing-in reaches the designed rock entry elevation, informing the participating parties of carrying out hole forming acceptance check on site representatives.
(2) During the acceptance, the drilling record, the slag sample, the mechanical pore-forming acceptance record, the technical cross-bottom and other data are provided.
(3) And after the height of the top of the pile casing is retested, measuring the hole depth by using a measuring rope, and calculating whether the actual rock entering elevation meets the design requirement.
(4) And detecting whether the thickness of the sediment meets the design requirement.
In the construction step, the hole depth should exceed the designed hole depth by 50-10 mm; the thickness of the sediment is not more than 50 mm; as the pile foundation is independent in water, the slurry circulating system cannot meet the requirement of site construction, hole cleaning needs to be realized by adopting gas-lift reverse circulation equipment, and drilling slag needs to be recovered to a slurry ship, transferred to land for airing and then transferred to a digestion site for centralized treatment.
The construction step five: steel reinforcement cage is transferred down
(1) The steel reinforcement cage is made the shaping in reinforcing bar processing field, and the external diameter of cage is 135cm, and 22 root phi 25mm twisted steel are adopted to the owner muscle, and the total length is 10m, adopts 25t boat crane to transfer the transportation to the drill way and lifts by crane and transfer.
(2) And calculating the length of the hanging rib according to the rock surface elevation and the pile casing top elevation before the steel bar is placed downwards.
(3) After the steel reinforcement cage is placed in place, the hanging ribs and the steel protective cylinder are welded and fixed, and the steel reinforcement cage is prevented from floating upwards in the concrete pouring process.
The operation key points are as follows: the calculation formula of the length of the hanging bar = the top elevation of the protective cylinder-the elevation of the rock surface-5 m (not counting the lap joint).
The construction step six: secondary hole cleaning
(1) And the secondary hole cleaning adopts a gas lift reverse circulation method (clear water) to clean the holes.
(2) The air compressor equipment is placed on the slurry ship, and the slag discharge pipe is connected with the cabin to form a waste slag pool.
(3) In the gas lift reverse circulation process, clear water is supplemented into the hole in time, and the height of the water head is strictly controlled.
(4) The bottom of the hole needs to be repeatedly shaken left and right in the hole cleaning process, so that residues are prevented from being left at the bottom of the hole.
In this construction step, sediment thickness must not be greater than 50mm, because be the aquatic operation, has certain regional restriction, clear hole in-process, should strengthen operation personnel safety education, dresses life-saving equipment, arranges the slag pipe and forbids in throwing the entering river course strictly.
The construction step seven: concrete pouring
(1) The trestle pile foundation is underwater C30 concrete, and the concrete is transferred to a tanker ship by a land tanker through a chute arranged on the shore.
(2) The tank car ship transports the concrete to an orifice to be poured, and a hopper with the diameter of 150cm is adopted for pouring.
(3) And after the concrete is poured into the hopper in a self-discharging manner and is filled, the filling is started by cutting the balls.
(4) And measuring the elevation of the concrete in the hole at any moment in the process, and stopping pouring after the elevation reaches the designed elevation.
The operation key points are as follows: (1) when the guide pipe is installed, the distance between the bottom of the guide pipe and the bottom of the hole is 30-40 cm; (2) the quantity of the first batch of concrete is required to meet the requirement that the first embedding depth of the conduit is more than 1.0 m; (3) during the perfusion process, the embedding depth of the catheter is preferably controlled to be 2 m-6 m, the perfusion is suspended when the embedding depth exceeds the range, and the perfusion can be continued after the upper section of the catheter is detached.
In the construction step, (1) before the guide pipe is used, a water tightness test is carried out, and the water pressure is not less than 1.3 times of the depth of water in the hole; (2) before concrete pouring, slump tests are carried out on the concrete, and when the diameter D of the pile is less than 1.5m, the slump test is 180-220 mm; d is preferably 160-200 mm when the diameter is larger than or equal to 1.5 m. (3) The concrete pouring height should be 50cm higher than the designed pile top elevation.
By adopting the embodiment, the invention solves the problems that the front half part of the buoyancy tank is lifted to the draught depth of about 30cm by adopting the chain block of 20t on 2 positioning piles, the thrust is carried out, if the platform has the condition of large shaking, the chain block is tensioned again for adjustment, and the positioning of the floating platform is finished after repeated testing to the optimal state. In addition, the invention adopts the chain block to lift the floating box, and the weight of the floating box is utilized to press the positioning pile, thereby increasing the stability of the positioning pile and reducing the displacement of the platform caused by vibration.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1.A construction method of a deepwater steel trestle bored pile is characterized by comprising the implementation of preparation work, process flow design and construction steps, and comprises the following steps:
step (1), preparation work: before construction, sounding the river bed elevation at the pile foundation by using a depth finder, and determining the lowering length of the steel casing; (1, b) performing technical and safety intersection on constructors before operation, and explaining major hazard sources and cautions existing in the process; (1, c) all the needed relevant tools, tools and instruments are in place, and normal operation of field electric and mechanical equipment is ensured; the main equipment is as follows: the method comprises the following steps of self-manufacturing a floating platform, an 80t floating crane, a self-manufacturing floating platform, a 25t ship crane, a tank truck ship, a D630 vibration hammer, an air compressor and a CK3000 impact drill;
designing a process flow in the step (2): sequentially preparing construction, anchoring and positioning a floating platform, lowering a protective cylinder, drilling, forming holes, cleaning the holes, pouring a lower reinforcement cage and concrete, preparing a reinforcement raw material to detect whether the raw material meets the use standard of the raw material at the construction preparation stage, and simultaneously making the reinforcement cage in advance;
and (3) implementation of the construction step: (3a) the construction method comprises the following steps: positioning a floating platform; (3b) and a second construction step: lowering the steel casing; (3c) and a third construction step: punching; (3d) the construction step four: checking and accepting the formed holes; (3e) the construction step five: lowering a reinforcement cage; (3f) the construction step six: secondary hole cleaning; (3g) the construction step seven: pouring concrete;
positioning the floating platform: the floating platform is pulled to a designated position by adopting the assault boat, and the total station tracks in real time; throwing the anchor blocks in four directions to the position of about 50m by using an 80t floating crane to ensure the stability of the floating platform; inserting and striking a D630 positioning steel pipe to the rock surface by adopting an 80t floating crane and a D90 vibration hammer; 2 hand chain blocks of 20t are hung on the steel pipe upright post and tensioned to keep the floating platform in a semi-suspension state, so that the floating platform is ensured to shake forwards and backwards due to the influence of impact force in the process of rushing in;
the cylinder body is lowered (1) a steel casing with the diameter of 1520 × 10mm is lowered to a rock stratum along a guide frame by adopting an 80t floating crane, the casing is inserted into the rock stably by adopting a 25t boat crane and a vibration hammer, after the casing is inserted and beaten stably, whether the axis of the casing meets the requirement is measured, if so, the casing top is beaten by the vibration hammer according to the instruction sent by a measuring person for adjustment, and the floating platform and the steel casing are limited by adopting channel steel welding;
the punching: after the drill is positioned, a 25t boat crane is adopted to install and debug the hammer; backfilling partial rubbles and clay according to the proportion of 3: 1; the low stroke is rushed until the hammer is stable; normal flushing, repeatedly dragging the slag by using a slag dragging barrel when the slag is too thick;
and (3) checking and accepting the formed holes: after the rushing-in reaches the designed rock entry elevation, informing the participating parties of performing hole forming acceptance check on site representatives; during the acceptance, providing drilling record, slag sample and mechanical pore-forming acceptance record and technical cross-bottom data; after the height of the top of the pile casing is measured again, measuring the hole depth by using a measuring rope, and calculating whether the actual rock entering elevation meets the design requirement; detecting whether the thickness of the sediment meets the design requirement;
the steel reinforcement cage is put down, namely the steel reinforcement cage is manufactured and molded in a steel reinforcement processing field, the outer diameter of the cage is 135cm, 22 threaded steel bars with the diameter of 25mm are adopted as main reinforcements, the total length is 10m, and 25t boat cranes are adopted for putting down and transporting to the orifices for lifting and putting down; calculating the length of the hanging bar according to the rock surface elevation and the pile casing top elevation before lowering; after the reinforcement cage is put down in place, the hanging ribs and the steel protection cylinder are welded and fixed, so that the reinforcement cage is prevented from floating upwards in the concrete pouring process;
and (3) secondary hole cleaning: secondary hole cleaning is carried out by adopting a gas lift reverse circulation method (clear water); the air compressor equipment is placed on the slurry ship, and the slag discharge pipe is connected with the cabin to form a waste slag pool; in the gas lift reverse circulation process, clear water is supplemented into the hole in time, and the height of a water head is strictly controlled; the bottom of the hole needs to shake repeatedly during the hole cleaning process, so that residues are prevented from being left at the bottom of the hole;
pouring the concrete: the trestle pile foundation is underwater C30 concrete, and the concrete is transferred to a tanker ship in water by a land tanker through a chute arranged at the shore; the tank car ship conveys the concrete to an orifice to be poured, and a hopper with the diameter of 150cm is adopted for pouring; pouring concrete into a hopper in a self-discharging manner, and then beginning to pour by cutting balls; and measuring the elevation of the concrete in the hole at any moment in the process, and stopping pouring after the elevation reaches the designed elevation.
2. The construction method of the deepwater steel trestle bored pile according to claim 1, wherein during the positioning of the floating platform, attention should be paid to the fact that the pile does not exceed the range of a channel when anchoring is performed, and after the anchoring is performed, a specially-assigned person commands the ship so that the steel wire rope cannot be scraped to cause the displacement of the floating platform;
once the scraping phenomenon occurs, the steel wire rope of the winch is required to be quickly loosened to prevent the steel wire rope from being damaged.
3. The method as claimed in claim 1, wherein during the lowering of the casing and before the lowering of the casing, a measuring rope is used to measure the elevation of the river bed, and the steel casing blanking length is calculated back to inform a processing plant of preparing materials in advance to prevent the casing from being unable to be lowered due to insufficient length.
4. The construction method of the deep water steel trestle bored pile according to claim 1, wherein during the lowering of the cylinder, the deviation of the steel casing is not more than 300mm, and the inclination is not more than 1%.
5. The method for constructing the bored pile of the deep water steel trestle according to the claim, wherein during the punching, a small stroke punching is adopted during the hole opening to prevent the pile casing from deviating, and the pile casing can be normally punched after the hole opening completely enters the rock stratum.
6. The construction method of the deep water steel trestle bored pile according to claim 1, wherein in the hole formation inspection, the hole depth should exceed the designed hole depth by 50mm to 10 mm; the thickness of the sediment is not more than 50 mm.
7. The construction method of the deepwater steel trestle bored pile according to claim 1, wherein when the reinforcement cage is lowered, a calculation formula of the length of the suspension bar = sheath top elevation-rock surface elevation-5 m, and the length of the suspension bar does not account for the length of the lap joint part.
8. The construction method of the deep water steel trestle bored pile according to claim 1, wherein during concrete pouring, a guide pipe is installed with a distance of 30-40 cm from the bottom of a hole.
9. The construction method of the deepwater steel trestle bored pile according to claim 1, wherein the quantity of the first concrete during the concrete pouring is required to meet the requirement that the first embedding depth of the guide pipe is more than 1.0 m.
10. The construction method of the deepwater steel trestle bored pile according to claim 1, wherein during the concrete pouring, the depth of the conduit is controlled to be preferably 2m to 6m, the pouring is suspended when the depth exceeds the range, and the pouring can be continued after the upper conduit is removed.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112081101A (en) * | 2020-09-14 | 2020-12-15 | 重庆大学 | Steel pipe temporary support restraint system |
| CN112538852A (en) * | 2020-11-30 | 2021-03-23 | 湖北工建基础设施建设有限公司 | Construction method of deepwater bored pile for thin covering layer |
| CN113309084A (en) * | 2021-06-02 | 2021-08-27 | 甘肃路桥第四公路工程有限责任公司 | Construction method for full casing of underwater cast-in-situ bored pile |
-
2020
- 2020-03-13 CN CN202010177960.0A patent/CN111395169A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112081101A (en) * | 2020-09-14 | 2020-12-15 | 重庆大学 | Steel pipe temporary support restraint system |
| CN112081101B (en) * | 2020-09-14 | 2021-10-19 | 重庆大学 | Steel pipe temporary support restraint system |
| CN112538852A (en) * | 2020-11-30 | 2021-03-23 | 湖北工建基础设施建设有限公司 | Construction method of deepwater bored pile for thin covering layer |
| CN113309084A (en) * | 2021-06-02 | 2021-08-27 | 甘肃路桥第四公路工程有限责任公司 | Construction method for full casing of underwater cast-in-situ bored pile |
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